SetStarts.h

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//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt for details.
//
//  This software is distributed WITHOUT ANY WARRANTY; without even
//  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
//  PURPOSE.  See the above copyright notice for more information.
//============================================================================
// Copyright (c) 2018, The Regents of the University of California, through
// Lawrence Berkeley National Laboratory (subject to receipt of any required approvals
// from the U.S. Dept. of Energy).  All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// (1) Redistributions of source code must retain the above copyright notice, this
//     list of conditions and the following disclaimer.
//
// (2) Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
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// (3) Neither the name of the University of California, Lawrence Berkeley National
//     Laboratory, U.S. Dept. of Energy nor the names of its contributors may be
//     used to endorse or promote products derived from this software without
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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//=============================================================================
//
//  This code is an extension of the algorithm presented in the paper:
//  Parallel Peak Pruning for Scalable SMP Contour Tree Computation.
//  Hamish Carr, Gunther Weber, Christopher Sewell, and James Ahrens.
//  Proceedings of the IEEE Symposium on Large Data Analysis and Visualization
//  (LDAV), October 2016, Baltimore, Maryland.
//
//  The PPP2 algorithm and software were jointly developed by
//  Hamish Carr (University of Leeds), Gunther H. Weber (LBNL), and
//  Oliver Ruebel (LBNL)
//==============================================================================
 
#ifndef vtk_m_worklet_contourtree_augmented_mesh_extrema_inc_set_starts_h
#define vtk_m_worklet_contourtree_augmented_mesh_extrema_inc_set_starts_h
 
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_augmented
{
namespace mesh_extrema_inc
{
 
 
// Worklet for computing the sort indices from the sort order
class SetStarts : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(
    FieldIn sortIndices,       // (input) index into active vertices
    ExecObject meshStructure,  // (input) execution object with the mesh structure
    WholeArrayOut meshExtema); // (output) whether critical
  typedef void ExecutionSignature(_1, _2, _3);
  using InputDomain = _1;
 
  // Constructor
  VTKM_EXEC_CONT
  SetStarts() {}
 
  template <typename MeshStructureType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& sortIndex,
                            const MeshStructureType& meshStructure,
                            const OutFieldPortalType& meshExtrema) const
  {
    meshExtrema.Set(sortIndex, meshStructure.GetExtremalNeighbour(sortIndex));
 
    // In serial this does
    // for (indexType sortIndex = 0; sortIndex < mesh.sortIndices.size(); sortIndex++)
    //   { // per vertex
    //        extrema[sortIndex] = mesh.GetExtremalNeighbour(sortIndex, isMaximal);
    //   } // per vertex
  }
}; // Mesh2D_DEM_VertexStarter
 
 
} // namespace mesh_dem_triangulation_worklets
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif